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Synthesis of mixed alkali-metal-zinc enolate complexes derived from 2,4,6-trimethylacetophenone: new inverse crown structures

Baillie, S.H. and Hevia, E. and Kennedy, A.R. and Mulvey, R.E. (2006) Synthesis of mixed alkali-metal-zinc enolate complexes derived from 2,4,6-trimethylacetophenone: new inverse crown structures. Organometallics, 26 (1). pp. 204-209. ISSN 0276-7333

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Abstract

The solution and solid-state characterization of two new mixed alkali-metal−zinc enolate compounds is reported. These compounds are prepared by reaction of the relevant mixed-metal base [MZn(HMDS)3] (M = Na, K; HMDS = 1,1,1,3,3,3-hexamethyldisilazide) with a stoichiometric amount of the sterically demanding ketone 2,4,6-trimethylacetophenone. Thus, the new mixed-metal enolate compounds [Na2Zn2{OC(=CH2)Mes}6{OC(CH3)Mes}2] (2) and [K2Zn2{OC(=CH2)Mes}6(CH3Ph)2] (3) are obtained for M = Na, K, respectively. X-ray crystallographic studies reveal that both compounds adopt the same structural motif, which define them as inverse crown complexes, a cationic eight-membered [(MOZnO)2]2+ ring which hosts in its core two additional enolate ligands. Each Zn center is bonded to four anionic enolate ligands framing the structure, whereas the alkali metals form much weaker interactions with the oxygen atoms and complete their coodination sphere by bonding to a neutral molecule, an unenolised ketone for M = Na or toluene for M = K.

Item type: Article
ID code: 10251
Keywords: enolate complexes, deprotonation, ketones, alkali-metal enolates, crown structures, Physical and theoretical chemistry
Subjects: Science > Chemistry > Physical and theoretical chemistry
Department: Faculty of Science > Pure and Applied Chemistry
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 12 Apr 2011 09:49
    Last modified: 12 Mar 2012 10:53
    URI: http://strathprints.strath.ac.uk/id/eprint/10251

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